Crash on SKILL.md files with non-OpenCode frontmatter schema #7575

Description

OpenCode crashes when it discovers .claude/skills/*/SKILL.md files that have frontmatter fields that don't match OpenCode's expected schema.

Steps to Reproduce

1. Have a project with Claude Code skills in .claude/skills/*/SKILL.md
2. These SKILL.md files have frontmatter like:

---
name: task-dispatch
skill_type: framework
description: Some description here
---

3. Run opencode in the project directory
4. Type anything and press enter

Expected Behavior

OpenCode should either:

• Skip SKILL.md files that don't match its expected frontmatter schema
• Provide a config option to disable skill discovery entirely
• Log a warning and continue instead of crashing

Actual Behavior

ConfigFrontmatterError: ConfigFrontmatterError
  path: "/path/to/.claude/skills/task-dispatch/SKILL.md",

[ERROR] Error: Unexpected end of JSON input
    SyntaxError: Unexpected end of JSON input

The crash occurs on every input, making OpenCode unusable in projects with Claude Code skills.

Environment

• OpenCode version: 1.1.10
• OS: macOS (Darwin 24.6.0)
• Installed via: Homebrew

Attempted Workarounds (none worked)

• Adding .claude/ to watcher.ignore in opencode.json
• Setting "tools": {"skill*": false} in opencode.json
• Setting "instructions": [] in opencode.json
• Creating a .ignore file with .claude/ pattern

The skill scanning appears to happen at startup before any config is read.

Suggested Fix

1. Wrap the frontmatter parsing in a try-catch and skip files that fail to parse
2. Add a config option like "skills": { "discovery": false } to disable skill scanning entirely
3. Respect the watcher.ignore patterns during skill discovery